Wavelength in one full standing wave

one complete wave in a standing wave pattern consists of two loops. Thus, one loop is equivalent to one-half of a wavelength

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the standing wave within =1 oscillates at the fundamental frequency and has a wavelength that is twice the length of the string . Higher integer value of n correspond to mode of oscillation called harmonics or overtones . Any standing waves on the string will have n +1 node including the fixed end and n anti-nodes.

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electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.